Content Provider
Directory of Open Access Journals: DOAJ Articles
52
Università degli Studi di Genova: CINECA IRIS
30
Unknown
27
DataCite Metadata Store (German National Library of Science and Technology)
20
Copernicus Publications: E-Journals
15
PubMed Central (PMC)
15
Università degli Studi di Napoli "Parthenope": CINECA IRIS
15
MDPI Open Access Publishing
12
Niedersächsisches Online-Archiv NOA
12
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia)
11
Università Politecnica delle Marche: IRIS
10
Defense Technical Information Center: DTIC Technical Reports database
9
IRIS Università degli Studi di Napoli Federico II
9
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server)
8
Flanders Marine Institute (VLIZ): Open Marine Archive (OMA)
7
Natural Environment Research Council: NERC Open Research Archive
7
ScienceDirect (Elsevier - via Crossref)
7
eCite UTAS (University of Tasmania)
7
Springer Nature (via Crossref)
6
Università degli Studi di Siena: USiena air
6
Università degli studi di Trieste: ArTS (Archivio della ricerca di Trieste)
6
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam)
5
PANGAEA - Data Publisher for Earth & Environmental Science
5
University of Canterbury, Christchurch: UC Research Repository
5
University of Tasmania: UTas ePrints
5
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB)
4
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel)
4
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca)
4
Università degli Studi della Campania "Luigi Vanvitelli": CINECA IRIS V:
4
Wiley Online Library
4
Wiley Online Library (via Crossref)
4
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe)
3
HighWire Press (Stanford University)
3
KU Leuven: Lirias
3
Padua Research Archive (IRIS - Università degli Studi di Padova)
3
University of Southampton: e-Prints Soton
3
Université de Nantes: HAL-UNIV-NANTES
3
ARPI - Archivio della Ricerca dell'Università di Pisa
2
Cambridge University Press
2
Columbia University: Academic Commons
2
Digital.CSIC (Spanish National Research Council)
2
Georg-August-Universität Göttingen: GOEDOC
2
IRIS Università degli Studi di Bologna (CRIS - Current Research Information System)
2
Institute of Oceanology, Chinese Academy of Sciences: IOCAS-IR
2
National Institute of Polar Research Repository, Japan
2
OpenSky (NCAR/UCAR - National Center for Atmospheric Research/University Corporation for Atmospheric Research)
2
ScholarsArchive@OSU (Oregon State University)
2
University of California: eScholarship
2
University of Groningen research database
2
University of Illinois at Urbana-Champaign: IDEALS (Illinois Digital Environment for Access to Learning and Scholarship)
2
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